Micrometer-calipers



G. W. POILLON MICROMETER CALIPERS.

APPLICATION FILED FEB. 11, 1919.

Patented Aug. 12, 1919.

GEORGE W. POILLON, OF TARBYTOWN, NEW YORK.

MICROMETER-CALIPERS.

Specification of Letters Patent.

Patented Aug. 12, 1919.

Application filed February 11, 1919. Serial No. 276,376.

Toall whom it may concern Be it known that I, GEORGE W. Pornnon, a citizen of the United States, residing at Tarrytown, in the county of Westchester and State of New York, have invented certain new and useful Improvements in Micrometer Calipers, of which the following is a specification.

This invention relates to a micrometer caliper having interchangeable frames of different sizes, adapted for connection and use with a single-micrometer barrel, thus obviating the necessity of many complete and expensive sizes of micrometer calipers some of which are only occasionally re quired.

An object of the invention is to provide, in a micrometer caliper structure as specified, means whereby the frames'of difierent sizes may be quickly and conveniently at tached to the micrometer barrel, and to include an extension upon the frame which will engage a portion of the barrel for securely bracing the connection between the frame and the barrel and providing a rigid caliper.

Other objects of the invention will appear in the following detailed description, taken in connection with the accompanying drawing, formin a part of this application, and in whic drawing:

Figure 1 is a side elevation of the improved micrometer caliper.

Fig. 2 is a side elevation of a frame of larger size than the frame illustrated in Fig. 1, and

Fig. 3 is an enlarged fragmentary section taken on the line 3-3 of Fig. 1.

Referring more particularly to the drawing, wherein like characters indicate like and corresponding parts, 1 indicates the micrometer barrel of the calipers, which is graduated in the usual manner, and includes the movable spindle 2, which coacts with the anvil or contact 3 in measuring various articles. The anvil 3 is carried by the frame 4, which latter is detachably connected to the barrel 1. The ring 5, which is the ordinary ring at the inner end of the barrel 1 has its depending lug 6 formed integrally therewith which is seated in .a socket 7 formed in one face of the frame 4. The upstanding rear portion of the frame 4 may be increased in thickness if desired, for reinforcing the frame. The lug 6 is provided with openings 8 extending therethrough, through which the smooth portions 9 of the shanks of the thumb screws 10 extend and the threaded portions of these shanks 9 are threadably engaged in open ings 12, formed in the frame l and communicating with the recess 7. The frame 4: has a web 13 which is of decreased thickness with respect to the frame proper, formed thereon and the upper edge of this web projects a short distance above the upper edge of the rear end of the frame as clearly shown at 14, in Figs. 1 and 2 of the draw ings. The web' 13 which is substantially itriangularly shaped abuts the stationary portion 1 of the micrometer barrel 1, between the innermost graduation thereon and the ring 5, assisting in securely bracing the frame 4 and providing a firm and rigid attachment or connection between the frame and the micrometer barrel.

The frame structure 4:? illustrated in Fig. '2 of the drawing, is similar to the frame 4 in its details differing therefrom only in its span, or size, it being provided for use in connection with the micrometer barrel 1 for measuring articles of greater diameter or width, than those which could be measured through the use of the frame 4. This frame P carries the usual anvil or contact indicated at 3 and its inner or rear upstanding portion is provided with a socket 7 adapted to receive the lug 6 and it also has the web 13 formed thereon the upper portion 14 of which projects slightly above the upper end of the rear upstanding portion of the frame. This frame 4 is also provided with openings 12- communicating with the recess 7, and threaded to threadably receive the threaded portions of the shanks of the thumb screws 10 for connecting the frame to the micrometer barrel.

Changes in details may be made without departing from the spirit of this invention, but;

I claim:

1. In a micrometer caliper structure, the combination with an ordinary micrometer barrel, of a U-shaped frame carrying an anvil at one end, said frame provided at the other end with a recess in one side face thereof, a lug formed upon the stationary portion of said micrometer barrel and adapted for seating in said recess, said lug and frame provided with alining openings, the openings in said frame being threaded,

thumb screws extending through said lug openings and threaded into the openings in said frame for detachably connecting the frame to the barrel, a Web formed adjacent the barrel-receiving end of the frame, the upper surface of said web pr0]ect1ng a short distance above the upper surface of the adjacent end of the frame and being adapted for engagement against the portion of the stationary part of said barrel.

2. In a micrometer caliper structure, the

combination of a micrometer barrel, a U- shaped frame, means for detachably c0nprojecting a short distance above the upper 7 surface of such end and being adapted for engagement against the stationary part of the barrel.

GEORGE W. POILLON. 

